SWAT vs. the Horde

New

Ready or Not raids turn into a Left 4 Dead 2 outbreak: suspects become Hunters, Smokers, Boomers, Chargers, Tanks and Witches.

KING_NarsilJoined October 2026

Multiplayerup to 5 players, in the game's own lobbies

How to join The host makes a friends-only lobby from Multiplayer and invites friends from the "Lobby Manager"; friends accept, or join the host from the friends list on the main menu. Up to 5 players. Everyone playing needs this mashup from Melty.

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About

You play Ready or Not as normal: stack up, breach, clear. Then the Green Flu breaks out.

Slow-burn outbreak. Every mission starts as a normal raid. About a minute in, Left 4 Dead 2's horde stinger hits, your officer shouts "Incoming!", and suspects start turning into infected one by one. Later the whole building is overrun and they turn two at a time. Infected bash through doors to get to you.

The full Special Infected roster, each with its own behaviour:

Common Infected sprint at you, clawing.
Hunter pounces from up to 10 m and pins you until it dies.
Smoker hangs back, tongues you from 15 m and drags you in, choking.
Boomer vomits on you (or bursts when shot up close) and calls a horde: more suspects turn and every infected comes for you.
Charger charges across the room, smashes you aside and pummels you.
Tank is huge, soaks up thousands of damage and punches officers across the room.
Witch sits crying. Get too close or shoot her and she shrieks and rushes you.

The sound of the outbreak, straight from your own Left 4 Dead 2: horde music and drums, the Tank and Witch themes, special infected attack stingers, every moan, scream, pounce and punch, plus survivor warnings ("Hunter!", "Tank!", "Witch!") voiced by Coach, Nick, Ellis or Rochelle, positioned around you.

Co-op: up to 5 officers. Join through Ready or Not's own co-op lobby. The host runs the outbreak; the infected's movement and attacks reach everyone through the game itself, and the mod sends every player the same sounds and music. Co-op hasn't been tested with two players yet. Tell us how it goes.

You need Ready or Not and Left 4 Dead 2 installed. Melty sets up UE4SS and starts the Left 4 Dead 2 sound player alongside the game.

Settings (optional) in %LOCALAPPDATA%\SwatVsHorde\settings.cfg: survivor = coach|gambler|mechanic|producer|random, calm = 60 (seconds before the outbreak), turnOrder = tank,hunter,....

Honest limits: infected keep Ready or Not suspect bodies, because Unreal can't load Left 4 Dead 2's 3D models while the game runs. Everything you hear, how they move and attack, and the Director's pacing come from Left 4 Dead 2. No Valve or VOID Interactive files are included. Code: MIT, built with Claude Code.